{{Short description|Multiple star system in the constellation Taurus}} {{Starbox begin}} {{Starbox observe 2s | epoch = J2000 | constell = Taurus | component1 = A | ra1 = {{RA|03|34|26.629}}<ref name=dr3a/> | dec1 = {{DEC|+35|27|51.86}}<ref name=dr3a/> | appmag_v1 = 6.58<ref name=tycho/> | component2 = B | ra2 = {{RA|03|34|26.633}}<ref name=dr3b/> | dec2 = {{DEC|+35|27|52.17}}<ref name=dr3b/> | appmag_v2 = 6.84<ref name=tycho/> }} {{Starbox character | component1 = A | class = A3V<ref name=tokovinin1998/> | b-v = +0.13<ref name=tokovinin1998/> | u-b = | variable = | component2 = B | class2 = A3V<ref name=tokovinin1998/> | b-v2 = +0.13<ref name=tokovinin1998/> | u-b2 = | variable2 = }} {{Starbox astrometry | radial_v = +28.1<ref name=rv/> | prop_mo_ra = +9.908 | prop_mo_dec = −28.201 | pm_footnote = <ref name=dr3a/> | parallax = 5.4993 | p_error = 0.0587 | parallax_footnote = <ref name=dr3a/> | absmag_v = +0.5/+0.6<ref name=tokovinin1998/> }} {{Starbox orbit | reference = <ref name=malkov2012/> | period = 522.16 | eccentricity = 0.679 | axis = 0.625 }} {{Starbox detail | component1 = A | mass = 2.5<ref name=tokovinin1998/> | radius = 9.0<ref name=dr2a/> | gravity = | metal_fe = | temperature = 8,551<ref name=ticv8/> | luminosity = 52<ref name=dr2a/> | rotational_velocity = | rotation = | age_myr = | component2 = B | mass2 = 2.5<ref name=tokovinin1998/> | temperature2 = }} {{Starbox catalog | names = {{odlist | F=7&nbsp;Tau | BD=+23°473 | HD=22091 | HIP=16664 | HR=1086 }}<ref name="SIMBAD"/> }} {{Starbox reference | Simbad = 6+Tau }} {{Starbox end}}

'''7 Tauri''' is a multiple star in the northern constellation of Taurus. It has a combined apparent visual magnitude of 5.95,<ref name=xhip/> so, according to the Bortle scale, it is faintly visible from suburban skies at night. Measurements made with the Gaia spacecraft show an annual parallax shift of {{val|5.5|ul=mas}}, which is equivalent to a distance of around 593&nbsp;light years from the Sun.

7 Tauri is a binary star with two nearly equal components about {{val|0.7|ul="}} apart, designated as A and B. The spectrum of each star matches a stellar classification of A7V.<ref name=tokovinin1998/> {{val|22|u="}} away is a 10th-magnitude star, component C, which is itself a spectroscopic binary. In the past, these stars had been treated as a single system, but they are now known to have different proper motions and somewhat different distances.<ref name=tokovinin1998/>

==References== {{Reflist|refs=

<ref name=dr2a>{{Cite Gaia DR3|68486384567412992}}</ref>

<ref name=dr3a>{{Cite Gaia DR3|68486384567412992}}</ref>

<ref name=dr3b>{{Cite Gaia DR3|68486380271398912}}</ref>

<ref name=ticv8>{{cite journal |bibcode=2018AJ....156..102S |title=The TESS Input Catalog and Candidate Target List |last1=Stassun |first1=Keivan G. |last2=Oelkers |first2=Ryan J. |last3=Pepper |first3=Joshua |last4=Paegert |first4=Martin |last5=De Lee |first5=Nathan |last6=Torres |first6=Guillermo |last7=Latham |first7=David W. |last8=Charpinet |first8=Stéphane |last9=Dressing |first9=Courtney D. |last10=Huber |first10=Daniel |last11=Kane |first11=Stephen R. |last12=Lépine |first12=Sébastien |last13=Mann |first13=Andrew |last14=Muirhead |first14=Philip S. |last15=Rojas-Ayala |first15=Bárbara |last16=Silvotti |first16=Roberto |last17=Fleming |first17=Scott W. |last18=Levine |first18=Al |last19=Plavchan |first19=Peter |author20=the TESS Target Selection Working Group |journal=The Astronomical Journal |year=2018 |volume=156 |issue=3 |page=102 |doi=10.3847/1538-3881/aad050 |arxiv=1706.00495 |s2cid=73582386 |doi-access=free }}</ref>

<ref name=tycho>{{cite journal |last1=Fabricius |first1=C. |last2=Høg |first2=E. |last3=Makarov |first3=V. V. |last4=Mason |first4=B. D. |last5=Wycoff |first5=G. L. |last6=Urban |first6=S. E. |title=The Tycho double star catalogue |journal=Astronomy & Astrophysics |date=March 2002 |volume=384 |issue=1 |pages=180–189 |doi=10.1051/0004-6361:20011822 |issn=0004-6361 |bibcode=2002A&A...384..180F |doi-access=free}}</ref>

<ref name=xhip>{{cite journal | last1 = Anderson | first1 = E. | last2 = Francis | first2 = Ch. | title = XHIP: An extended hipparcos compilation | journal = Astronomy Letters | date = May 2012 | volume = 38 | issue = 5 | pages = 331–346 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773712050015 | bibcode = 2012AstL...38..331A | arxiv = 1108.4971| s2cid = 119257644 }}</ref>

<ref name=tokovinin1998>{{cite journal |bibcode=1998AstL...24..288T |title=New spectroscopic components in six multiple systems |last1=Tokovinin |first1=A. A. |journal=Astronomy Letters |year=1998 |volume=24 |issue=3 |page=288 }}</ref>

<ref name=rv>{{cite journal |last1=Gontcharov |first1=G. A. |title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal=Astronomy Letters |date=November 2006 |volume=32 |issue=11 |pages=759–771 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G |arxiv=1606.08053|s2cid=119231169 }}</ref>

<ref name=malkov2012>{{cite journal | display-authors=1 | last1=Malkov | first1=O. Yu. | last2=Tamazian | first2=V. S. | last3=Docobo | first3=J. A. | last4=Chulkov | first4=D. A. | title=Dynamical Masses of a Selected Sample of Orbital Binaries | journal=Astronomy & Astrophysics | volume=546 | id=A69 | pages=5 | date=2012 | doi=10.1051/0004-6361/201219774 | bibcode=2012A&A...546A..69M | doi-access=free }}</ref>

<ref name="SIMBAD">{{cite simbad | title=7 Tau | access-date=2022-09-20 }}</ref>

}}

{{Stars of Taurus}} {{Sky|03|34|26.6|+|35|27|52}}

Category:Taurus (constellation) Tauri, 007 1086 Category:Durchmusterung objects 022091 016664 Category:A-type main-sequence stars